I need to find a op-amp that will handle the high input voltages that my circuit requires. I'm not real familiar with them and not sure how to read their datasheets. I do have a LM741 but it looks like it can only handle +/- 15v. I need at least +/- 60v I think, but I have include the schematic that I used to test with. U1 is just LTSpice's ideal single-pole op-amp. Any suggestions on a particular op-amp or what I need to be looking for would be greatly appreciated.
I'm trying to use Vout to turn on the gate of a PMOS which is switching a variable voltage from a boost converter. V2 will come from boost converter and V1 will be what I subtracting from V2 so that the PMOS will cut on. The PMOS will be on when Source = Vout and off when Source = Source. The second schematic is the boost converter and the current configuration which uses a voltage divider to control the gate voltage, but I'm concerned that PMOS will not turn all the way on when the voltage is lowered all the way to 12v. I think that Vgs will just be to small using a voltage divider.
- M2 is the PMOS
- M3 is a NMOS used to control the voltage divider.
- The two signals will be coming from Micro Controller.